Centrifugal switch.



E. M. TORMIN.

GENTBIFUGAL SWITCH.

APPLICATION FILED JULY 31, 1912.

PatentedAug. 18, 1914.

AWIIM Emu iHx/EHTEIF EGMONT Max mm, or rmwro n CENTER, mnssacnusnr'rsassrenon r0 HOLTZER- or ancient-inn. MASSACHUSETTS.

vOriginal. application filed January- 27, .1912, Serial No. 673,724 Divided and I I 1912. Seria1No.712,504.

STATES PATENT- OFFICE? CABOT ELECTRIC COMPANY,

' onu'rmr'nesn swrron.

To all inhomit may concern: V 7 Be it known that I, EeMorrrM. TonMiN,

a subject of the German Emperor, anda resident of Newton Center, in the county of Middlesex and State of Massachusetts, have invented a new'anduseful'Improvement in Centrifugal Switchesyof which the following is a specification.

The present invention relates to centrifugal switches and .niore especially to such switches which are adapted for use with lightingmachinesj f y In my application Serial No. 673',724e,

Y filed January27, 1912,0fwhich this applirect current lighting machineadapted to be cation is a division, I have described a di-' driven through Wide variations of'speed by a motor vehicle. In machines ofthis character it is desirable that a certain minimum speed, such for example as two hundred revolutions per m nute, be obtai-ned'before the extei'nal circuit is" energized, and for 'lerated-switchor cut-out which forms the this purpose I providethe centrifugally-opsubject matterof the present. inventi on.

- One emb odiment of my invention illustrated' in the drawings which accompany and form'a part of this specification. Inthc drawings-Figure 11s a diagram.

showing one arrangement of circuits which may be employed when my improved cen-- trifugal switch is used in connection with a hghtmg generator. Fig.2 1s a 'front it View of the preferred form of my improved I 35 cut-out. Fig. 3 is a" section taken on the line 33 of Fig. 2 and Fige is a horizontal sectiontak'en on the line 4-4 of Fig.- .2.

In the 1 particular drawings selected for more fully disclosing my invention, 5 represents the generatonprovided with brushes 40, the winding 9 herein shownflas a shunt winding, and havingthe' switch or cuteout keyed to its shaft 1. The switch consists in the present instance of 'the collector hub 20 of brass or other suit-ablematerialkeyed to the shaft 1 and. carrying the segmental:

collectorring 6, secured thereto byscrews 22 and shown in the present instance as made up of three segments 21, 21', 21-',' each-"suitably insulated from the collector 1 hub; switch member 23 consisting of a ortion of a ring is 'secured the; collector 'ub Specification of Letters llatent. Pate n td Aug. 18, 1914.

this application filed July 51, i

the screws 24 andissuitably insulated from the same. Passing through the switch mem-- her 23 is a screw 25 which clamps the inside and outside circular plate-springs 29 and separated at this point by the spacing member 50, between-the block 23 and said switch member, said block23 beingin electrical contact with the segment 21. Two 'centrifugally. operated "heads-26, 26 are securedto the inner spring 29 by-t-he rivets 28, which preferably are of copper, the rivets 27 passing through the plate, the spring,

and the'head, as shown in Fig. In order to prevent friction between the springs the extremities only ofthe outer spring 30 may bear against .the inner spring 29, and for this purpose the ends of the former are bent inradially as shown at 31,- 31. A mica 27. and are provided with contact plates 28,.

'cover plat-e 32 is interposed between the" cut-cutand the commutator. Itwill be ap- ,parcnt that the rotation of the shaftl will cause the. heads26, 26 to move outwardly,

'made to bear against the interiorof the segmental collector ring when any predetermined speed of rotation has been attained, and, by making electrical contact with the 'segments'2l, 21",short circuit the same.

Referring to the diagram shown in Fig. 1, 40, 40 represent the dynamo brushes and 4:1, 41 the. cut-out brushes. '43 is a source of current" preferably a storage battery; 44 represents incandescent lamps, such for example, as the head-lights of an automobile. The 'cut -outi's connected in series with the line 46, 46, as shown, and the storage battery and lamps are connected 'across the same. It will be obvious'that the line remains open until theplates 28,28 make contact with" the ring 21 and short-circuit the segment. thereof.

It will be understood that I do not limit myself to the particular embodiment of my invention which I have described and illus and that by suitable p'roportionment of the springs 29, 30,the contact plates 28 can be trated, inasmuch as variousmodifications I 8 may be made by those skilled in the art, both in the apparatus described and in; the circuit arrangements employed therewith, that will accomplish the objects of my invention in substantially thesame manner,

I claim: i 1. In a dynamo electric machine, a cut-out compris ng a collector hub-mounted on the axle of the'machine, a collector ring comprising aplurality of segments secured to said hub, centrifugally-operated contact members arranged to make contact with the interior of said collector ring when the machine attains a' predetermined speed, 'but normally out of contact therewith, and brushes constantly maintained in electrical contact with the exterior of said ring.

2. In a dynamo electric machine, a cut-out comprising a collector hub mounted on the axle of the machine a collector ring com prising a plurality of segments secured to said hub, spring-retracted centrifugally-operated contact members arrangedvto make contact with the interior of said -collector ring when the machine attains a predeter- 'mineds'peed, but normally out of contact therewith, and brushes constantly maintained in electricalcontact with the exterior of said ring.

3. In a dynamo electric machine, a cut-out comprising a collector hub mounted on the axle of the machine, a collector ring comprising three segments secured to the hub, two centrifugally-operated contact members arranged to make contact respectively'with two of said segments and means for electrically connecting said contact members with the third segment.

- prising a- 4. Ina dynamo electric machine, a cut-out comprising a collector hub mounted on the axle of the machine, a collector ring complurality of segments secured to said hub, centrifugally-operated .contact members arranged to make contact with the interior of said collector ring when the machine attains a predetermined speed, but normally out of contact therewith, a circular plate-spring normally tending to retract said said hub,

with.

contact a circular 6. In a dynamo electric machine a cut-out comprising a collector hub mounted on the axle of the machine, a collector ring comprising aplurality of segments'secured .to said hub and normally insulated from each other, centrifugally-operated means for short-circuiting said segments when the machine attains a predetermined speed,and brushes constantly maintained in electrical contact with the exterior of said ring.

7. In a dynamo electric machine, a cut-out comprising a collector ring, said collector ring consisting of a plurality of segments mounted on androtating with the axle of.

the machine, centrifugal y-operated contact members arranged to make contact with the interior of said ring when the machine attains a predetermined speed, but normally out of contact therewith and brushes malt ing contact with the exterior of said ring.

In testimony whereof, I have hereunto subscribed my name this. 27th day of-July 1912.

EGMONT MAX TOR-MIN.

W'itnesses: Q

Geo. K. VVoonwoRrH, E. B. ToMmNsoN, 

